JP2005190525A - Information recording method, and optical disk apparatus - Google Patents
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
- G11B7/1267—Power calibration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H27/00—Special constructions, e.g. surface features, of feed or guide rollers for webs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H20/00—Advancing webs
- B65H20/02—Advancing webs by friction roller
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2301/00—Handling processes for sheets or webs
- B65H2301/40—Type of handling process
- B65H2301/44—Moving, forwarding, guiding material
- B65H2301/443—Moving, forwarding, guiding material by acting on surface of handled material
- B65H2301/4431—Moving, forwarding, guiding material by acting on surface of handled material by means with operating surfaces contacting opposite faces of material
- B65H2301/44318—Moving, forwarding, guiding material by acting on surface of handled material by means with operating surfaces contacting opposite faces of material between rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/13—Details of longitudinal profile
- B65H2404/131—Details of longitudinal profile shape
- B65H2404/1316—Details of longitudinal profile shape stepped or grooved
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/10—Handled articles or webs
- B65H2701/17—Nature of material
- B65H2701/175—Plastic
- B65H2701/1752—Polymer film
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Abstract
Description
本発明は、半導体レーザを用いて、情報記録媒体上に情報を記録する光ディスク装置に関する。 The present invention relates to an optical disc apparatus that records information on an information recording medium using a semiconductor laser.
データの記録可能な光ディスクとして、一度だけデータの記録可能な追記型光ディスク（ＣＤ−Ｒ、ＤＶＤ−Ｒ、ＤＶＤ＋Ｒなど）と、データの書換可能な書き換え型光ディスク（ＣＤ−ＲＷ、ＤＶＤ−ＲＡＭ、ＤＶＤ−ＲＷ、ＤＶＤ＋ＲＷなど）がある。 As an optical disc capable of recording data, a write-once optical disc (CD-R, DVD-R, DVD + R, etc.) capable of recording data only once, and a rewritable optical disc (CD-RW, DVD-RAM, DVD) capable of recording data. -RW, DVD + RW, etc.).
追記型光ディスクでは、有機色素により構成されている記録層がレーザ光照射により変質し、ピットが形成されデータが記録される。一方、書き換え型光ディスクでは、相変化と呼ばれる記録層の可逆変化により、データの書き換えを実現している。具体的には、高パワーのレーザ光を照射すると、急冷効果により非晶質状態となり、中間パワーのレーザ光を照射すると、徐冷効果により結晶状態となる。このような相変化により、データの記録・消去が行われる。 In a write-once optical disc, a recording layer composed of an organic dye is altered by laser light irradiation, pits are formed, and data is recorded. On the other hand, in the rewritable optical disk, data rewriting is realized by a reversible change of the recording layer called phase change. Specifically, when irradiated with high-power laser light, it enters an amorphous state due to a rapid cooling effect, and when irradiated with intermediate-power laser light, it enters a crystalline state due to a slow cooling effect. Data recording / erasing is performed by such a phase change.
光ディスクへの記録時には、光ディスクと光ディスク装置の組み合わせにより記録条件のばらつきが発生する。例えば、温度や湿度等の外部環境、光ディスクの記録膜の特性や、溝形状・ディスクの反り等の機械特性等が挙げられる。光ディスク装置のなかには、このようなばらつきの影響を小さくするための調整方法を採用しているものもある。 At the time of recording on the optical disc, the recording condition varies depending on the combination of the optical disc and the optical disc apparatus. Examples include the external environment such as temperature and humidity, the characteristics of the recording film of the optical disk, and the mechanical characteristics such as the groove shape and the warp of the disk. Some optical disc apparatuses employ an adjustment method for reducing the influence of such variations.
例えば、種々の記録条件において最適な記録を行うため、ＯＰＣ（Ｏｐｔｉｍｕｍ Ｐｏｗｅｒ Ｃｏｎｔｒｏｌ）と呼ばれる記録レーザパワーの調整を行う光ディスク装置がある。これは、それぞれの光ディスクに設けられているレーザパワー調整領域であるＰＣＡ（Ｐｏｗｅｒ Ｃａｌｉｂｒａｔｉｏｎ Ａｒｅａ）に試し書きを行い、当該領域の再生結果の上下対称性（アシンメトリ）から各記録条件において最適なレーザパワーを決定する方法である（例えば、特許文献１、２参照）。
For example, there is an optical disc apparatus called OPC (Optimum Power Control) that adjusts a recording laser power in order to perform optimum recording under various recording conditions. This is a test writing on a PCA (Power Calibration Area), which is a laser power adjustment area provided on each optical disc, and the optimum laser power in each recording condition from the vertical symmetry (asymmetry) of the reproduction result of the area. (For example, refer to
近年、光ディスクへの記録時間の短縮化の要求から、光ディスクへの記録速度の高速化が望まれている。高速記録を行なう方法として、光ディスクの内周側領域では低い線速度で記録を行い、外周側領域では高い線速度で記録を行うことで、記録に要する時間を短縮する方法がある。ここで、光ディスクを回転させるモータの特性などに起因し、光ディスクの回転数には上限があるため、内周側で達成可能な線速度にも限界がある。このため、ディスクの内周側に設けられているＰＣＡ領域では、外周側領域での記録速度での試し書きは事実上不可能である。一方、低速記録時よりも高速記録時のほうが記録パワー変動による記録品質劣化の影響が大きいため、高速での試し書きの必要性がより大きいという問題もある。 In recent years, due to the demand for shortening the recording time on an optical disk, it is desired to increase the recording speed on the optical disk. As a method of performing high-speed recording, there is a method of shortening the time required for recording by performing recording at a low linear velocity in the inner peripheral area of the optical disc and recording at a high linear velocity in the outer peripheral area. Here, due to the characteristics of the motor that rotates the optical disk, etc., the rotational speed of the optical disk has an upper limit, so there is a limit to the linear velocity that can be achieved on the inner circumference side. For this reason, in the PCA area provided on the inner circumference side of the disc, trial writing at the recording speed in the outer circumference area is virtually impossible. On the other hand, there is a problem that the necessity of trial writing at a high speed is greater because the influence of the recording quality deterioration due to the recording power fluctuation is larger in the high speed recording than in the low speed recording.
上記特許文献１、２にも示されるように、従来より外周の試し書き領域を設けたＣＤが知られていたが、従来の外周の試し書き領域の使用方法では、処理手順が複雑であったり、十分な性能が得られない等の問題があった。
As shown in
本発明が解決しようとする課題は、内周側の試し書き領域、および、外周側の試し書き領域を用いて、高速の試し書きを適切に行なう試し書き方法、および、それを用いた光ディスク装置を提供することである。 SUMMARY OF THE INVENTION Problems to be solved by the present invention are a trial writing method for appropriately performing high-speed trial writing using a test writing area on the inner circumference side and a test writing area on the outer circumference side, and an optical disk apparatus using the same. Is to provide.
上記課題は、内周側試し書き領域と、データ領域と、外周側試し書き領域とを有する記録型光ディスクにレーザ光を照射して情報を記録する情報記録方法であって、前記内周側試し書き領域に試し書きを行い、前記外周側試し書き領域に試し書きを行なった後、前記データ領域に情報の記録を行う情報記録方法により改善される。 The above-described problem is an information recording method for recording information by irradiating a laser beam onto a recordable optical disc having an inner circumference side trial writing area, a data area, and an outer circumference side trial writing area. This is improved by an information recording method in which trial writing is performed in a writing area, trial writing is performed in the outer peripheral side trial writing area, and information is recorded in the data area.
また、内周側試し書き領域と、データ領域と、外周側試し書き領域とを有する記録型光ディスクにレーザ光を照射して情報を記録する情報記録方法であって、前記外周側試し書き領域に試し書きを行い、前記内周側試し書き領域に試し書きを行なった後、前記データ領域に情報の記録を行う情報記録方法により改善される。 An information recording method for recording information by irradiating a laser beam onto a recordable optical disc having an inner circumference side trial writing area, a data area, and an outer circumference side trial writing area, wherein the information is recorded in the outer circumference side trial writing area. This is improved by an information recording method in which information is recorded in the data area after performing test writing and performing test writing in the inner periphery side test writing area.
さらに、内周側試し書き領域と、データ領域と、外周側試し書き領域とを有する記録型光ディスクにレーザ光を照射して情報を記録する光ディスク装置であって、前記光ディスクを回転させるスピンドルと、前記光ディスクにレーザ光を照射するレーザと、該レーザを備えた光ピックアップと、を具備し、前記光ピックアップは、前記内周側試し書き領域に試し書きを行い、前記外周側試し書き領域に試し書きを行なった後、前記データ領域に情報の記録を行う光ディスク装置により改善される。 Further, an optical disk apparatus for recording information by irradiating a laser beam onto a recordable optical disk having an inner circumference side trial writing area, a data area, and an outer circumference side trial writing area, and a spindle for rotating the optical disk; A laser for irradiating the optical disc with laser light; and an optical pickup equipped with the laser. The optical pickup performs test writing in the inner peripheral side test writing region and performs test in the outer peripheral side test writing region. This is improved by an optical disk device that records information in the data area after writing.
さらに、内周側試し書き領域と、データ領域と、外周側試し書き領域とを有する記録型光ディスクにレーザ光を照射して情報を記録する光ディスク装置であって、前記光ディスクを回転させるスピンドルと、前記光ディスクにレーザ光を照射するレーザと、該レーザを備えた光ピックアップと、を具備し、前記光ピックアップは、前記外周側試し書き領域に試し書きを行い、前記内周側試し書き領域に試し書きを行なった後、前記データ領域に情報の記録を行う光ディスク装置により改善される。 Further, an optical disk apparatus for recording information by irradiating a laser beam onto a recordable optical disk having an inner circumference side trial writing area, a data area, and an outer circumference side trial writing area, and a spindle for rotating the optical disk; A laser for irradiating the optical disc with laser light; and an optical pickup provided with the laser. The optical pickup performs test writing in the outer peripheral side test writing region and performs test in the inner peripheral side test writing region. This is improved by an optical disk device that records information in the data area after writing.
異なる記録速度で連続的に記録を行う場合において、それぞれの記録変動要因をキャンセルすることができ、高品質な記録が可能となる。 When recording is performed continuously at different recording speeds, each recording variation factor can be canceled, and high-quality recording is possible.
まず、本発明の第1の実施形態について説明する。本実施形態は、記録品質を確保するために、光ディスク外周にある試し書き領域に試し書きを行い、光ディスク内周と外周の記録特性を比較し、その結果として、個々の光ディスクに存在する内周と外周の変動要因を取り除き、併せて、外周側で高速記録を行う際の速度での記録性能を確保することを目的とする。 First, a first embodiment of the present invention will be described. In this embodiment, in order to ensure recording quality, trial writing is performed in a test writing area on the outer periphery of the optical disc, and the recording characteristics of the inner and outer peripheries of the optical disc are compared. As a result, the inner perimeter existing in each optical disc is compared. It is an object to eliminate the fluctuation factors of the outer circumference and to ensure recording performance at a speed when performing high-speed recording on the outer circumference side.
図１は、本発明の第１の実施形態にかかる光ディスク装置の構成を示すブロック図である。１０１は情報記録媒体である光ディスク、１０２はスピンドル、１０３は光ピックアップ、アナログ信号処理回路１０４、サーボ回路１０５、レーザパワー制御回路１０６、記録波形生成回路１０７、中央演算処理回路１０８である。
FIG. 1 is a block diagram showing the configuration of the optical disc apparatus according to the first embodiment of the present invention.
図７は、本発明の第１の実施形態にかかる光ディスクの構成を示す図である。ディスク最内周に位置するのが７０１の内周の試し書き領域（ＰＣＡ、Ｐｏｗｅｒ Ｃａｌｉｂｒａｔｉｏｎ Ａｒｅａ）、続いて７０２が記録情報管理領域（ＲＭＡ、Ｒｅｃｏｒｄｉｎｇ Ｍａｎａｇｅｍｅｎｔ Ａｒｅａ）、７０３がリードイン領域、７０４がユーザデータ領域、７０５がリードアウト領域、７０６が外周の試し書き領域（ＰＣＡ）である。 FIG. 7 is a diagram showing a configuration of the optical disc according to the first embodiment of the present invention. The innermost test write area (PCA, Power Calibration Area) 701 is located at the innermost circumference of the disk, then 702 is a recording information management area (RMA, Recording Management Area), 703 is a lead-in area, and 704 is a user. A data area, 705 is a lead-out area, and 706 is an outer peripheral test writing area (PCA).
再生時には、１０３光ピックアップより出射されるレーザにより、光ディスク１０１に予め記録されている信号が読み出される。この信号はアナログ信号処理回路１０４を介して、中央演算処理回路１０８に送られる。回転制御回路１０５はディスク上に予め埋め込まれている周期信号であるウォブル信号もしくは、予め記録された同期信号を基準にして、データの読み出しに最適な回転速度をスピンドル１０２に送り、読み出し位置を光ピックアップに送り、ディスク上の所定の場所に位置付けを行う。
During reproduction, a signal recorded in advance on the
記録時には、中央演算処理回路１０８において記録用の情報に変換されたデータがレーザパワー制御回路１０６及び記録波形生成回路１０７に送られる。レーザパワー制御回路１０６は情報記録時に最適なレーザ記録パワーを制御する。記録波形生成回路１０７は記録情報のデータ長に応じた記録発光波形を生成する。回転制御回路１０５は記録速度に応じた回転速度をスピンドル１０２に送り、記録位置を光ピックアップに送り、ディスク上の所定の場所に位置付けを行う。
At the time of recording, data converted into information for recording in the central processing circuit 108 is sent to the laser power control circuit 106 and the recording
なお、レーザは環境温度によって、その出力光量が変動する。そのため、レーザパワー制御回路１０６では、出力変動に対応してレーザパワーの補正を行う。図２はＬＤ（Ｌａｓｅｒ Ｄｉｏｄｅ）駆動電流と出力レーザパワーの関係を示した図である。例えば二つの環境（ａ）（ｂ）において、同じレーザパワーＰｏを出力するためには、それぞれＩａ、Ｉｂの駆動電流を流さなければならない。このため、動作環境が（ａ）から（ｂ）に変化したときには、レーザパワー制御回路は、駆動電流をＩａからＩｂに補正し、レーザ光の出力パワーを安定化させる必要がある。 The output light amount of the laser varies depending on the environmental temperature. Therefore, the laser power control circuit 106 corrects the laser power corresponding to the output fluctuation. FIG. 2 is a diagram showing the relationship between LD (Laser Diode) drive current and output laser power. For example, in two environments (a) and (b), in order to output the same laser power Po, drive currents Ia and Ib must be supplied, respectively. For this reason, when the operating environment changes from (a) to (b), the laser power control circuit needs to correct the drive current from Ia to Ib and stabilize the output power of the laser beam.
図３は、記録するレーザパワーと再生時に検出されるβ（アシンメトリと同様に再生信号の上下対称性を評価できるパラメータ）に関する図である。固定のストラテジで記録パワーＰｏを変化させて記録した場合、図３のように記録パワーとβとの関係は、最適な記録パワー付近において、略比例の関係にある。そして、データ領域に記録を行う場合には、試し書き領域で記録パワーを変化させて記録し、その後当該の場所を再生して、ターゲットβとなる領域を検出し、最適な記録パワーＰｏを導出する。ここで、記録パワーとβの関係は設計段階で予め測定しており、良好な記録特性が得られる記録パワーＰｏで記録した時のβをターゲットβとして、試し書きの時の目安とされている。 FIG. 3 is a diagram regarding the laser power to be recorded and β detected during reproduction (a parameter that can evaluate the vertical symmetry of the reproduction signal in the same manner as the asymmetry). When recording is performed by changing the recording power Po with a fixed strategy, the relationship between the recording power and β is substantially proportional in the vicinity of the optimum recording power as shown in FIG. When recording is performed in the data area, recording is performed by changing the recording power in the test writing area, and then the corresponding place is reproduced to detect the area serving as the target β, and the optimum recording power Po is derived. To do. Here, the relationship between the recording power and β is measured in advance at the design stage, and β at the time of recording at the recording power Po at which good recording characteristics can be obtained is set as a target β, which is a guideline for trial writing. .
図４は、同一の光ディスクにおいて、記録速度と再生時に検出されるＰＩエラーの関係を模式的に示した図である。複数の記録媒体についての説明では内容が複雑になるため、以降ＤＶＤ−Ｒについて記載する。例として、８倍速記録に対応した光ディスクの記録再生の結果を示した。ＰＩエラーのグラフの中心付近に記録パワーを設定すると、各種の記録パワー変動要因に対して、安定した記録が行うことができる。β８、β６、β４はそれぞれ８倍速記録、６倍速記録、４倍速記録の最適なβ値である。各々の記録速度で、最適なβ値が変化することが分かる。また、記録速度の高速化に伴い、β値の変動をより高精度に制御しなければ、安定した記録品質が確保できないことがわかる。 FIG. 4 is a diagram schematically showing the relationship between the recording speed and the PI error detected during reproduction on the same optical disc. Since the contents of the description of the plurality of recording media become complicated, the DVD-R will be described hereinafter. As an example, the result of recording / reproducing of an optical disc corresponding to 8 × speed recording is shown. If the recording power is set near the center of the PI error graph, stable recording can be performed for various recording power fluctuation factors. β8, β6, and β4 are optimum β values for 8 × speed recording, 6 × speed recording, and 4 × speed recording, respectively. It can be seen that the optimum β value changes at each recording speed. Further, it can be seen that stable recording quality cannot be ensured unless the β value fluctuation is controlled with higher accuracy as the recording speed increases.
図５は、本発明の第１の実施形態にかかるフローチャートを示した図である。まず、最初のステップＳ１として、内周の記録速度の設定、及びストラテジの設定を行う。記録速度は、ディスクと光ディスク装置との組み合わせの中から、ユーザより指定された、もしくは光ディスク装置により取り決められた記録速度が設定される。そして、ストラテジは、予め設計段階において検証されたもの、もしくはディスクに予め埋め込まれているもの等が適応される。 FIG. 5 is a view showing a flowchart according to the first embodiment of the present invention. First, as the first step S1, the recording speed of the inner circumference and the strategy are set. As the recording speed, a recording speed designated by the user or determined by the optical disk apparatus is set from a combination of the disk and the optical disk apparatus. A strategy that has been verified in advance at the design stage, or that has been embedded in a disk is applied.
次にＳ２では、ディスクと光ディスク装置との組み合わせで最適と予想される記録パワーを中心に、記録パワーとその後の再生結果の関係が確認できるように、前後いくつかの記録パワーが設定される。 Next, in S2, several recording powers are set before and after the recording power and the relationship of the subsequent reproduction results so that the relationship between the recording power and the subsequent reproduction result can be confirmed centering on the recording power expected to be optimum for the combination of the disk and the optical disk device.
そしてＳ３では、実際に先に設定したいくつかの記録パワーで記録を行い、記録した領域を再生する。この再生結果においては、反射率、変調度、β、ＰＩエラー等の測定が行われ、最適な記録パワーが検出される。周辺条件の違いにより、最適な記録パワーが求まらない場合は、周辺条件の再設定を行った後に、改めてＳ１からやり直し、最適な記録パワーＰｏを検出する。 In S3, recording is actually performed with several recording powers set in advance, and the recorded area is reproduced. In this reproduction result, the reflectance, modulation factor, β, PI error, etc. are measured, and the optimum recording power is detected. If the optimum recording power cannot be obtained due to the difference in the surrounding conditions, after resetting the surrounding conditions, the process starts again from S1, and the optimum recording power Po is detected.
なお、試し書きに用いる記録波形の一例として、ＤＶＤ−Ｒの記録波形を図８に示す。ここに示すように、３Ｔ（Ｔは記録クロック）、４ＴのＮＲＺは１パルスの記録波形で記録し、５Ｔ以上のＮＲＺは記録パワーＰｏとＰｍの２値を使用したストラテジで記録するとなる。５Ｔ以上のＮＲＺの記録時には、先頭と後方のみ高パワー（Ｐｏ）で、中間は先頭、後方の記録パワーよりも低い（もしくは同等の）記録パワー（Ｐｍ）が推奨されている。 As an example of a recording waveform used for test writing, a recording waveform of DVD-R is shown in FIG. As shown here, 3T (T is a recording clock), NRZ of 4T is recorded with a recording waveform of one pulse, and NRZ of 5T or more is recorded with a strategy using binary values of recording powers Po and Pm. When recording NRZ of 5T or more, it is recommended that the recording power (Pm) is high (Po) only at the head and the rear, and lower (or equivalent) than the recording power at the head and the rear.
内周の試し書きにおいて最適な記録パワーが求まると、続いて外周の試し書きに移行する。Ｓ５では、Ｓ１同様に外周の記録速度の設定、及びストラテジの設定が行われる。外周の記録速度は内周の記録速度と同じ場合もあり得る。Ｓ６の記録パワーの設定は内周の記録パワーの設定とは異なり、外周記録速度で最適と予想される記録パワーで記録を行う。
この記録パワーは、ディスク内周で行った試し書きの結果と、内周と外周の記録速度の関係から所定の係数の掛算により求めることができる。記録速度ｖと記録パワーＰｏの関係は、熱変化を利用している光ディスクにおいて、
Ｐｏ ＝ ｋ×√ｖ …（式１）
のように１／２乗に比例する関係が成り立つ（ｋは比例定数）。例えば、内周４倍速、外周８倍速記録（外周記録速度÷内周記録速度＝２）の場合は、内周で求めた４倍速対応最適記録パワーをＰｏとすると、外周における８倍速対応最適記録パワーは１．４１Ｐｏと求められる。
When the optimum recording power is obtained in the inner periphery test writing, the process proceeds to the outer periphery test writing. In S5, the outer peripheral recording speed and the strategy are set as in S1. The outer peripheral recording speed may be the same as the inner peripheral recording speed. The setting of the recording power in S6 is different from the setting of the inner peripheral recording power, and recording is performed at the recording power expected to be optimum at the outer peripheral recording speed.
This recording power can be obtained by multiplying a predetermined coefficient from the result of trial writing performed on the inner circumference of the disc and the relationship between the recording speeds of the inner circumference and the outer circumference. The relationship between the recording speed v and the recording power Po is as follows:
Po = k × √v (Formula 1)
Thus, a relationship proportional to 1/2 power is established (k is a proportional constant). For example, in the case of 4 × inner circumference and 8 × outer circumference recording (outer circumference recording speed ÷ inner circumference recording speed = 2), if the optimum recording power corresponding to the 4 × speed obtained at the inner circumference is Po, the optimum recording corresponding to the 8 × speed at the outer circumference is performed. The power is required to be 1.41 Po.
ただし、各記録ストラテジに応じて最適記録パワーは変化する場合があり、さらに、ディスクの外周では記録膜の塗布むらなどの変動要因も多いため、計算により求められた外周での最適記録速度が適切なものであるか判断するには、少なくとも１／４周程度は試し書きするのが好ましい。ほとんどの変動要因は１／４周分の平滑化で除去することが可能だからである。 However, the optimum recording power may vary depending on each recording strategy.Further, there are many fluctuation factors such as uneven coating of the recording film on the outer circumference of the disc, so the optimum recording speed on the outer circumference obtained by calculation is appropriate. In order to determine whether it is correct, it is preferable to test-write at least about 1/4 turn. This is because most of the fluctuation factors can be removed by smoothing for 1/4 turn.
つまり、一定の長さの区間に試し書きを行なう場合、異なる記録パワーでの試し書きを複数回繰り返すことで外周における最適記録パワーを求めるよりも、計算により求められた一値の記録パワーで試し書きを行い、当該記録パワーが好適な記録パワーであるか否かを判断する手法を用いるほうが、より好ましい結果を得ることができる。 In other words, when performing trial writing in a section of a certain length, rather than obtaining the optimum recording power at the outer periphery by repeating the trial writing with different recording powers multiple times, the trial writing is performed with a single recording power obtained by calculation. A more preferable result can be obtained by writing and using a method for determining whether or not the recording power is a suitable recording power.
Ｓ７において、Ｓ６で設定した記録パワーで記録再生し、反射率、変調度、β、ＰＩエラー等の測定を行う。そして、予め光ディスク装置の設計段階で検証された結果に基づき、外周での試し書きの結果を判定し、記録パワーとβの関係から、最適な記録パワーを決定する。 In S7, recording / reproduction is performed with the recording power set in S6, and the reflectance, modulation factor, β, PI error, and the like are measured. Then, based on the result verified in advance in the design stage of the optical disc apparatus, the result of trial writing on the outer periphery is determined, and the optimum recording power is determined from the relationship between the recording power and β.
なお、Ｓ８の外周最適記録パワーの決定に関して、Ｓ７においては、記録結果が最適記録パワーと異なる場合、算出結果を使用するとしたが、例えば、試し書きの記録パワーが算出後の最適記録パワーから１０％以上離れているなど、最適値と大きく異なる場合は、Ｓ５もしくはＳ６よりやり直し、記録速度を下げる、ストラテジを変更する、記録パワーを変更するなどの再設定を行い、再び試し書きの記録再生を行い、最適記録パワーを求める。 Regarding the determination of the outermost optimum recording power in S8, the calculation result is used when the recording result is different from the optimum recording power in S7. For example, the recording power of the test writing is 10 from the optimum recording power after the calculation. If it is significantly different from the optimal value, such as more than%, repeat from S5 or S6, reset the recording speed, change the strategy, change the recording power, etc. To determine the optimum recording power.
Ｓ９においては、内周と外周の最適記録パワー及び変調度、β等の関係から、当該ディスクの内周、外周の記録感度差が概算でき、その結果に基づき、内周から外周に向かって記録する記録パワーを導出することができる。 In S9, the difference in recording sensitivity between the inner circumference and the outer circumference of the disc can be estimated from the relationship between the optimum recording power and modulation degree of the inner circumference and the outer circumference, β, etc., and recording is performed from the inner circumference to the outer circumference based on the result. The recording power to be obtained can be derived.
例えば、光ディスク全面に渡り４倍速記録する場合、内外周のディスク感度の違いのみが影響するため、予め設計段階で求めた結果に基づき、感度補正を行う。 For example, when quadruple speed recording is performed over the entire surface of the optical disc, only the difference in disc sensitivity between the inner and outer circumferences is affected, so sensitivity correction is performed based on the results obtained in advance in the design stage.
例えば、感度差分の線形補完を行う形式で、
Ｐｏ ＝ Ｐｏｉ×（１＋Ｒ×Ｐｏｏ／Ｐｏｉ） …（式２）
の関係で記録パワーの設定が可能である（Ｐｏｏは外周の最適記録パワー、Ｐｏｉは内周の最適記録パワー、Ｒは半径位置に基づく係数）。
For example, in the form of linear interpolation of sensitivity difference,
Po = Poi × (1 + R × Poo / Poi) (Formula 2)
Therefore, the recording power can be set (Poo is the optimum recording power on the outer periphery, Poi is the optimum recording power on the inner periphery, and R is a coefficient based on the radial position).
なお、ＰｏとＰｍが所定の比率の関係を保つようにするため、
Ｐｍ ＝ Ｐｏ／Ａ …（式３）
でＰｍを求める（Ａは予め決められた値もしくは、試し書きに基づいて求められる値）。
In order to maintain a predetermined ratio between Po and Pm,
Pm = Po / A (Formula 3)
To obtain Pm (A is a predetermined value or a value obtained based on test writing).
次に、内周４倍速、外周８倍速の場合は同様の算出式に対して、記録速度に応じた変更分も含まれるため、記録パワー導出の関係式の一例として、
Ｐｏ４ ＝ Ｐｏｉ×（１＋Ｒ×（Ｐｏｏ／ｒａｔｉｏ）／Ｐｏｉ）
…（式４）
Ｐｏ８ ＝ （Ｐｏｉ×ｒａｔｉｏ）
×（１＋Ｒ×（Ｐｏｏ／ｒａｔｉｏ）／Ｐｏｉ） …（式５）
以上の関係式が挙げられる（Ｐｏ４は４倍速記録パワー、Ｐｏ８は８倍速記録パワー、ｒａｔｉｏはＰｏ４とＰｏ８との比例係数）。
Next, in the case of the inner circumference 4 × speed and the outer circumference 8 × speed, since a change corresponding to the recording speed is also included in the same calculation formula,
Po4 = Poi × (1 + R × (Poo / ratio) / Poi)
... (Formula 4)
Po8 = (Poi × ratio)
× (1 + R × (Poo / ratio) / Poi) (Formula 5)
The above relational expressions can be cited (Po4 is 4 × recording power, Po8 is 8 × recording power, and ratio is a proportional coefficient between Po4 and Po8).
先に示したように一般的には
Ｐｏ８ ＝ １．４１×Ｐｏ４ …（式６）
の関係が成り立つが、４倍速、８倍速のストラテジとの関係により、その係数は変わることもありうる。
As shown above, generally Po8 = 1.41 × Po4 (Formula 6)
However, the coefficient may change depending on the relationship with the 4 × speed or 8 × speed strategy.
なお、外周での記録パワーの選択を最適記録パワーに限定したのは以下の要因を考慮したものである。 Note that the selection of the recording power at the outer periphery is limited to the optimum recording power in consideration of the following factors.
・ディスク外周の記録性能が十分に得られないこと。 -The recording performance on the outer periphery of the disc cannot be obtained sufficiently.
・ディスク内周と比較して、外周のレーザパワーとの感度差が大きい場合があること。 -There may be a large difference in sensitivity with the laser power on the outer circumference compared to the inner circumference of the disk.
・ディスク外周の局所的な記録では、周方向の変動の影響を受けやすいこと。 • Local recording on the outer circumference of the disc is susceptible to fluctuations in the circumferential direction.
また、それぞれの実施例において、外周の試し書き記録パワーは内周の試し書きから導出される最適記録パワーのみとしたが、最適記録パワー導出の効率化から、最適記録パワーを基準に前後いくつか記録パワーを変化させて、記録再生を行ってもよい。 In each embodiment, only the optimum recording power derived from the inner periphery trial writing power is set as the outer peripheral trial writing power. Recording / reproduction may be performed by changing the recording power.
次に、本発明の第２の実施形態について説明する。光ディスク装置の構造は図１に示した構造と同等であるので説明は省略する。図６は、本発明の第２の実施形態にかかるフローチャートを示した図である。基本的な動作は第１の実施形態と同様である。ただし、まず外周の試し書き領域に試し書きを行った後、内周の試し書き領域で試し書きを行い、内外周の最適記録パワーを求める。 Next, a second embodiment of the present invention will be described. The structure of the optical disk device is the same as that shown in FIG. FIG. 6 is a view showing a flowchart according to the second embodiment of the present invention. The basic operation is the same as in the first embodiment. However, first, test writing is performed on the outer periphery test writing area, and then test writing is performed on the inner periphery test writing area to obtain the optimum recording power on the inner and outer periphery.
Ｓ６１では、まず外周の試し書き領域において外周の記録速度とそのストラテジを設定し、Ｓ６２において、外周の通常の試し書きを行う。ここで通常としているのは、従来の内周で行っているのと同様の方法であり、セクタ単位もしくはフレーム単位（セクタ、フレームは記録長さの単位）で記録パワーを変化させて記録を行い、その結果の反射率、変調度、β、ＰＩエラー等の測定に基づき記録パワーの最適値を求める。 In S61, first, the outer peripheral recording speed and the strategy are set in the outer peripheral test writing area, and in S62, the outer peripheral normal test writing is performed. The normal method here is the same as the method used in the conventional inner circumference, in which recording is performed by changing the recording power in units of sectors or frames (sectors and frames are units of recording length). Then, the optimum value of the recording power is obtained based on the measurement of the resulting reflectance, modulation factor, β, PI error, and the like.
続いて、Ｓ６３において、Ｓ６２より導出した最適記録パワーを設定し、１／４周程度試し書きの記録再生を行う。その結果の反射率、変調度、β、ＰＩエラー等の測定に基づき記録パワーの検証を行う。この場合は、ディスク外周から試し書きを行うため、通常の試し書きを行うとディスクの周方向の位置などに依存する影響を受ける。そのため、Ｓ６３のように、１／４周程度の最適記録パワーで記録し、その記録品質を確認する必要がある。 Subsequently, in S63, the optimum recording power derived from S62 is set, and test writing recording / reproduction is performed about 1/4 turn. The recording power is verified based on the measurement of the resulting reflectance, modulation factor, β, PI error, and the like. In this case, since trial writing is performed from the outer periphery of the disc, normal test writing is affected depending on the circumferential position of the disc. Therefore, as in S63, it is necessary to perform recording with an optimum recording power of about 1/4 turn and to confirm the recording quality.
Ｓ６４において、最適記録パワーで所望の測定結果が得られた場合、続いてＳ６５の内周の試し書き領域に移動し、内周の記録速度とそのストラテジを設定し、Ｓ６６の試し書きを行い、内周の最適記録パワーを得る。Ｓ６７は最適記録パワーの検出が正常に行えない場合に再度Ｓ６５、Ｓ６６を繰り返す。 In S64, when a desired measurement result is obtained with the optimum recording power, subsequently, the process moves to the test writing area on the inner circumference in S65, sets the recording speed on the inner circumference and its strategy, and performs the test writing in S66. Obtain the optimum recording power on the inner circumference. In S67, when the optimum recording power cannot be normally detected, S65 and S66 are repeated again.
以上の結果に基づき、Ｓ６８では、全面４倍速記録の場合は上述した（式２）（式３）から、各半径位置における最適記録パワーを導出する。内周４倍速、外周８倍速記録の場合も同様に（式４）（式５）（式６）に基づく記録パワーを設定することで、それぞれのディスクに応じた最適な記録が行うことが可能となる。 Based on the above results, in S68, the optimum recording power at each radial position is derived from (Equation 2) and (Equation 3) in the case of full-time 4 × speed recording. Similarly, in the case of inner circumference 4 × speed recording and outer circumference 8 × speed recording, it is possible to perform optimum recording according to each disc by setting the recording power based on (Equation 4), (Equation 5) and (Equation 6). It becomes.
なお、それぞれの実施例において、内周および外周の記録速度を、４倍速、８倍速として説明したが、本願発明はこのような記録速度に限定されるものでないことは言うまでもない。また、記録制御方式として、ＣＬＶ（Ｃｏｎｓｔａｎｔ Ｌｉｎｅａｒ Ｖｅｌｏｃｉｔｙ）制御、ＺＣＬＶ（Ｚｏｎｅ ＣＬＶ）制御を採用しても良い。 In each of the embodiments, the inner and outer recording speeds have been described as being 4 × speed and 8 × speed, but it goes without saying that the present invention is not limited to such recording speed. Further, as a recording control method, CLV (Constant Linear Velocity) control or ZCLV (Zone CLV) control may be employed.
１０１ 光ディスク
１０２ スピンドル
１０３ 光ピックアップ
１０４ アナログ信号処理回路
１０５ サーボ回路
１０６ レーザパワー制御回路
１０７ 記録波形生成回路
１０８ 中央演算処理回路
DESCRIPTION OF
Claims (12)
前記内周側試し書き領域に試し書きを行い、前記外周側試し書き領域に試し書きを行なった後、
前記データ領域に情報の記録を行うことを特徴とする情報記録方法。 An information recording method for recording information by irradiating a laser beam onto a recordable optical disc having an inner circumference side trial writing area, a data area, and an outer circumference side trial writing area,
After performing test writing in the inner periphery side test writing area, and performing test writing in the outer periphery side test writing area,
An information recording method comprising recording information in the data area.
前記外周側試し書き領域での試し書きは、前記内周側試し書き領域での試し書きにより求めた記録パワーから算出した記録パワーで行なうことを特徴とする情報記録方法。 The information recording method according to claim 1,
The information recording method according to claim 1, wherein the test writing in the outer peripheral side test writing area is performed with a recording power calculated from the recording power obtained by the test writing in the inner peripheral side test writing area.
前記外周側試し書き領域はフレームで構成されており、
前記外周側試し書き領域での試し書きは、複数のフレームに渡って行なわれることを特徴とする情報記録方法。 The information recording method according to claim 2,
The outer peripheral side test writing area is composed of a frame,
The information recording method according to claim 1, wherein the test writing in the outer peripheral side test writing area is performed over a plurality of frames.
前記外周側試し書き領域に試し書きを行い、前記内周側試し書き領域に試し書きを行なった後、
前記データ領域に情報の記録を行うことを特徴とする情報記録方法。 An information recording method for recording information by irradiating a laser beam onto a recordable optical disc having an inner circumference side trial writing area, a data area, and an outer circumference side trial writing area,
After performing test writing in the outer periphery side test writing area, and performing test writing in the inner periphery side test writing area,
An information recording method comprising recording information in the data area.
前記内周側試し書き領域での試し書きは、前記外周側試し書き領域での試し書きにより求めた記録パワーから算出した記録パワーで行なうことを特徴とする情報記録方法。 In the information recording method of Claim 4,
The information recording method according to claim 1, wherein the test writing in the inner periphery side test writing area is performed with a recording power calculated from the recording power obtained by the test writing in the outer periphery side test writing area.
前記内周側試し書き領域はフレームで構成されており、
前記内周側試し書き領域での試し書きは、複数のフレームに渡って行なわれることを特徴とする情報記録方法。 In the information recording method of Claim 5,
The inner circumference side trial writing area is composed of frames,
The information recording method, wherein the trial writing in the inner circumference side trial writing area is performed over a plurality of frames.
前記内周側試し書き領域での試し書きの速度と、前記外周側試し書き領域での試し書きの速度と、は同じ速度であることを特徴とする情報記録方法。 The information recording method according to claim 1 or 4,
The speed of trial writing in the inner periphery side test writing area and the speed of trial writing in the outer periphery side test writing area are the same speed.
前記内周側試し書き領域での試し書きの速度と、前記外周側試し書き領域での試し書きの速度と、は異なる速度であることを特徴とする情報記録方法。 The information recording method according to claim 1 or 4,
An information recording method characterized in that the speed of trial writing in the inner peripheral side test writing area and the speed of trial writing in the outer peripheral side test writing area are different.
前記光ディスクを回転させるスピンドルと、
前記光ディスクにレーザ光を照射するレーザと、
該レーザを備えた光ピックアップと、
を具備し、
前記光ピックアップは、前記内周側試し書き領域に試し書きを行い、前記外周側試し書き領域に試し書きを行なった後、前記データ領域に情報の記録を行うことを特徴とする光ディスク装置。 An optical disc apparatus for recording information by irradiating a laser beam onto a recordable optical disc having an inner circumference side trial writing area, a data area, and an outer circumference side trial writing area,
A spindle for rotating the optical disc;
A laser for irradiating the optical disc with laser light;
An optical pickup provided with the laser;
Comprising
The optical pickup apparatus is characterized in that the optical pickup performs trial writing in the inner peripheral side trial writing area, performs information writing in the data area after performing trial writing in the outer peripheral side trial writing area.
前記光ピックアップは、前記外周側試し書き領域での試し書きを、前記内周側試し書き領域での試し書きにより求めた記録パワーから算出した記録パワーで行なうことを特徴とする情報記録方法。 The optical disc apparatus according to claim 9, wherein
The information pickup method, wherein the optical pickup performs test writing in the outer peripheral side test writing area with a recording power calculated from a recording power obtained by trial writing in the inner peripheral side test writing area.
前記光ディスクを回転させるスピンドルと、
前記光ディスクにレーザ光を照射するレーザと、
該レーザを備えた光ピックアップと、
を具備し、
前記光ピックアップは、前記外周側試し書き領域に試し書きを行い、前記内周側試し書き領域に試し書きを行なった後、前記データ領域に情報の記録を行うことを特徴とする光ディスク装置。 An optical disc apparatus for recording information by irradiating a laser beam onto a recordable optical disc having an inner circumference side trial writing area, a data area, and an outer circumference side trial writing area,
A spindle for rotating the optical disc;
A laser for irradiating the optical disc with laser light;
An optical pickup provided with the laser;
Comprising
The optical pickup apparatus is characterized in that the optical pickup performs trial writing in the outer peripheral side trial writing area, records information in the data area after performing trial writing in the inner peripheral side trial writing area.
前記光ピックアップは、前記内周側試し書き領域での試し書きを、前記外周側試し書き領域での試し書きにより求めた記録パワーから算出した記録パワーで行なうことを特徴とする情報記録方法。
The optical disk apparatus according to claim 11, wherein
The information pickup method according to claim 1, wherein the optical pickup performs test writing in the inner peripheral side test writing area with a recording power calculated from a recording power obtained by test writing in the outer peripheral side test writing area.
Priority Applications (5)
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| JP2003428623A JP2005190525A (en) | 2003-12-25 | 2003-12-25 | Information recording method, and optical disk apparatus |
| TW093106355A TWI266300B (en) | 2003-12-25 | 2004-03-10 | Information recording method, and optical disk apparatus |
| KR1020040019283A KR100581638B1 (en) | 2003-12-25 | 2004-03-22 | Information recording method, and optical disk apparatus |
| US10/808,920 US7355941B2 (en) | 2003-12-25 | 2004-03-24 | Information recording method and optical disk apparatus for recording information on a recording-type optical disk |
| CNB2004100338654A CN1294566C (en) | 2003-12-25 | 2004-04-15 | Information recording method, and optical disk apparatus |
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| US (1) | US7355941B2 (en) |
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| JP3907639B2 (en) * | 2004-05-10 | 2007-04-18 | 三菱電機株式会社 | Optical recording method and optical recording apparatus |
| JP2006164443A (en) * | 2004-12-09 | 2006-06-22 | Sanyo Electric Co Ltd | Optical recording and reproducing apparatus |
| US20090154315A1 (en) * | 2007-12-04 | 2009-06-18 | Panasonic Corporation | Information recording medium, recording method, recording apparatus and integrated circuit |
| CN102318006A (en) | 2008-11-28 | 2012-01-11 | 布莱阿姆青年大学 | High-power CD drive |
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| JP3025622B2 (en) | 1994-02-23 | 2000-03-27 | 太陽誘電株式会社 | Method of using power calibration area of write-once optical disc and power calibration method |
| JPH1125575A (en) | 1997-07-01 | 1999-01-29 | Hitachi Ltd | Disk device and starting method of disk device |
| JPH11203728A (en) * | 1998-01-10 | 1999-07-30 | Ricoh Co Ltd | Information recording medium |
| US6639890B1 (en) * | 1998-06-29 | 2003-10-28 | Olympus Optical | Optical disk drive for precisely adjusting the intensity of laser light irradiated onto an optical disk |
| JP2000195054A (en) | 1998-12-24 | 2000-07-14 | Ricoh Co Ltd | Optical information-recording/reproducing apparatus |
| JP3765223B2 (en) * | 2000-05-23 | 2006-04-12 | ヤマハ株式会社 | Optical disc recording method and optical disc recording apparatus |
| JP4889853B2 (en) | 2000-12-05 | 2012-03-07 | ソニー株式会社 | Recording apparatus and recording medium |
| US6839310B2 (en) * | 2001-02-14 | 2005-01-04 | Matsushita Electric Industrial Co., Ltd. | Optical disk drive having optical power control |
| TW490660B (en) * | 2001-02-15 | 2002-06-11 | Acer Comm & Multimedia Inc | Optical power calibration method based on the positions of data writing |
| JP2002298356A (en) | 2001-03-30 | 2002-10-11 | Yamaha Corp | Optical disk recording method and device, and optical disk |
| JP4017837B2 (en) * | 2001-05-22 | 2007-12-05 | 株式会社日立製作所 | Information recording method and optical disc apparatus |
| JP2003141728A (en) * | 2001-11-05 | 2003-05-16 | Teac Corp | Optical disk unit |
| JP3873722B2 (en) | 2001-11-26 | 2007-01-24 | ティアック株式会社 | Optical disk device |
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| US20030123352A1 (en) * | 2001-12-28 | 2003-07-03 | Chien-Shou Chen | Method for controlling writing power in CAV mode |
| JP2003203342A (en) | 2002-01-07 | 2003-07-18 | Shinano Kenshi Co Ltd | Optical disk recording and reproducing device and data write control method for the device |
| JP3867962B2 (en) | 2002-03-05 | 2007-01-17 | 株式会社リコー | Recording condition determining program, recording medium, recording condition determining method, and information recording apparatus |
| JP2004086999A (en) | 2002-08-27 | 2004-03-18 | Ricoh Co Ltd | Recording condition setting method, program and recording medium, and optical disk device |
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| TWI266300B (en) | 2006-11-11 |
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